vertical ones will turn purple.
Win10 64-Bit, FL Studio v12.4.1 [build 4]
Screenshots (I'm sorry for the poor quality, I was unable to make a video):
< > https://ibb.co/gYGPam < >< > https://ibb.co/gokvgR < >< > https://ibb.co/fR9cvm < >< > https://ibb.co/jQeo1R < > ...
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